Both Democrats and Republicans have criticized the Obama administration's deal to swap five Taliban detainees for Sergeant Bowe Bergdahl. They argue releasing terrorists puts American lives at risk, and accuse Obama of breaking the law by not notifying Congress 30 days in advance.
Administration officials have said they consulted the Justice Department and acted legally.
But some Republican lawmakers have said they're not buying that argument, and want proof that Bergdahl's health was really in jeopardy.
In an interview with CNN's Erin Burnett, Republican Senator Susan Collins, a member of the Senate Intelligence committee explains why, if asked, she would not approve the deal.